You might be a little overspined, I think you are on the edge according to the chart, but that allegiance should make up a little difference too as hard as it shoots........

I would think form. Are you paper tuning? Who is shooting the bow? If your son is shooting the bow he is probably torqueing it and you may have to live with a little wobble until he gets comfortable and his form gets better, then go back to paper tuning. Also, maybe you're making too large of adjustments moving the rest while tuning? Thats about all I can come up with...